ABB 1TNA911005R1001 TOROID LNG 35/1A 0.25W 35mm-DIA(inside)

ABB 1TNA911005R1001 TOROID,LNG,35/1A,0.25W,35mm-DIA(inside)

ABB 1TNA911005R1001 is a toroidal current transformer from ABB, a leading manufacturer in power and automation technologies.

The part number decodes into the following specifications:

• Manufacturer: ABB

• Product Line: Likely from their 1TNA series, which is a common designation for ABB's measurement and protection devices.

• Part Number: 911005R1001

• Type: TOROID (Toroidal Current Transformer)

• Application: LNG (This likely stands for "Liquid Nitrogen Gas" or a specific industrial application line within ABB, but in this context, it primarily signifies a general-purpose, high-quality current transformer).

• Rated Primary Current (Ipn): 35 / 1 A

◦ This means it has a multi-ratio capability.

◦ It can be used as a 35/5A transformer (for a 35A primary circuit) or as a 1/5A transformer (for a 1A primary circuit). The secondary current for current transformers is almost always standardized to 5A or 1A; given the power rating, 5A is most likely.

• Rated Power (Pn): 0.25 W (or 0.25 VA)

◦ This is the maximum burden (load) the transformer can handle on its secondary side while maintaining its accuracy class.

• Physical Size: 35mm Diameter (inside)

◦ The inner diameter of the toroidal core is 35 mm. This is the hole through which the primary conductor (the cable or busbar being measured) passes.

Detailed Specifications & Interpretation

Parameter

Value

Explanation

Type

Toroidal Current Transformer

A ring-shaped transformer that encircles a primary conductor. It's highly efficient and has low magnetic leakage.

Primary Current (Ipn)

35 / 1 A

The nominal currents of the primary circuit it is designed to measure. The user selects the ratio by looping the primary conductor through the core a specific number of times.

Secondary Current (Isn)

(Likely) 5 A

The standardized output current. To get a 5A output with a 1A input, the primary conductor would be looped 5 times through the core.

Rated Burden (Pn)

0.25 VA

The maximum load (from connected meters, relays, etc.) its secondary circuit can support.

Accuracy Class

Not specified, but likely 1% or 0.5%

Common for such transformers. You would need to consult the official datasheet for the exact class (e.g., 1M5, 0.5).

Inner Diameter

35 mm

The size of the hole for the primary conductor. A 35mm hole can accommodate a fairly thick cable or small busbar.

Function

Measurement & Protection

Used to step down high primary currents to a safe, standardized level for connecting to ammeters, energy meters, protective relays, and other monitoring devices.